Opus 88 Demonstrator Fountain Pen - Clear
The Opus 88 Demonstrator fountain pen is a truly unique writing instrument. This large non-postable pen is an eyedropper-filled pen with a piston operated shut-off valve. Featuring a sharp alternating material scheme of frosted and clear resin, this pen’s design stands on its own. It has a sleek black clip and a silver stainless steel #6 JoWo nib and includes a glass eyedropper to fill the pen with your favorite ink.
Note: JoWo is transitioning their nib designs from the old scroll pattern to a more simple design. Stock is currently mixed; what you receive may not necessarily match what is photographed.
An ebonite piston and rubber gasket seals the feed off from the barrel when fully depressed, reducing the risk of leakage and burping. By unscrewing the blind cap and loosening the rod at the rear of the barrel, you open up the ink flow to the feed. During long writing sessions, leave the shut-off valve open to take advantage of the impressive ink capacity. Having a completely clear pen body allows you to see both your current ink level and your nib while capped.
- Condition
- New
- Brand
- Opus 88
- Type
- Fountain Pens
- Color
- Clear
- Demonstrator
Whether or not the barrel of the pen is translucent, allowing you to see the ink and filling mechanism inside.
- Yes
- Body Material
- Resin
- Cap Rotations
For pens with a screw-cap closure, how many rotations it takes to uncap/recap the pen.
- 4
- Cap Type
How the cap is opened/closed from the barrel of the pen. Some common options include Snap-Cap, Screw-Cap, Magnetic Cap, or Capless (no cap).
- Screw-cap
- Compatible inks & refills
Which ink this pen will accept. Choices include bottled ink and various styles of pre-filled ink cartridges.
- Bottled ink
- Filling Mechanism
How the pen fills with ink. Click here to watch our video tutorial on common filling mechanisms.
- Eyedropper
- Grip Material
- Resin
- Nib Size
- Extra-Fine, Fine, Medium, Broad, 1.5mm Stub
- Nib Color
- Silver
- Nib Material
- Steel
- Postable
Whether or not the cap fits securely onto the back of the barrel when open.
- No
- Retractable
Whether or not the nib/tip can retract into the body of the pen (usually for click or twist-open style pens).
- No
- Diameter - Body
- 14.9mm (0.59in)
- Diameter - Cap (without clip)
- 16.5mm (0.65in)
- Diameter - Cap (with clip)
- 21mm (0.83in)
- Diameter - Grip (mm)
Measured from the place most people choose to rest their fingers, which varies with each pen.
- 11.0mm
- Length - Body
The measurement from the back end of the barrel to the tip of the nib.
- 136.5mm (5.37in)
- Length - Cap
- 63.6mm (2.50in)
- Length - Nib
The measured length of the visible portion of the nib when it is installed in the pen, from grip to tip.
- 23mm (0.91in)
- Length - Overall (Closed)
- 147.6mm (5.81in)
- Weight - Body
If a converter is included with the pen, this weight is reflected in the total.
- 17g (0.60oz)
- Weight - Cap
- 10g (0.35oz)
- Weight - Overall (g)
- 27.0g
- Max Ink Capacity - Eyedropper
The maximum volume of ink that can fit in the pen when filling the entire barrel of the pen via eyedropper.
- 3.56ml
Customer Reviews
I picked up the Opus 88 Demonstrator (EF) after watching a Goulet YT video on it. What sold me on the pen was the massive reservoir and an interest in trying out an eye dropper style pen. The pen took a little bit of work to prime, but it has become my daily driver for journaling, paired with Pilot Yama-budo ink. From trying a few inks with the pen, it seems to prefer inks that are a littler higher in flow rate than other inks like Noodlers.
Yes the cap takes a lot of turns to get off; and it isn't postable. But you wouldn't want to post it as it would become top heavy and awkwardly long. Uncapped, it's the perfect length, and while it's a wide pen, it remains nimble and feels great in hand. It holds a tremendous amount of ink, avoids the pain of cartridges, and the nib is ultra smooth at least in my EF version. I can get just enough line variation to put down bold (pressure), medium (regular pressure) or thin (reverse nib). I really like the resin feel of the body, and that the body is transparent and all-the-same-width with a chunky, clear "twister" on the end. The overall look and feel is minimalist and high quality. Hope to use this in sketches for years.
I have been eyeing this pen for some time. Finally pulled the trigger and love it! Just wish it came with a black nib instead of the silver. That little extra touch would put it over the top!
Stunningly designed, expertly crafted, and the best filling system yet invented, the eyedropper with shut-off valve. I love everything about it. Except for one thing that annoys me every single time I use it. It takes four (4) full turns to screw the cap off. Two full turns would be excessive, but four is ridiculous. I guess I would add that the cap threads are not very smooth, and I ended up putting some silicone grease on them. For comparison, my Twsbi Diamond 580 takes just one turn, and the screw threads are silky smooth and dependable. I'm certainly not the only person who has complained about this problem. I would probably buy other Opus 88 pens if not for this fatal flaw. And it's impossible to recommend them to others. It would be a simple fabrication fix . . . if anyone at Opus 88 is listening . . .While you're at it, produce one of these in a frosted finish, it would be stunning.
I had heard great things about this pen and wanted to try it out. It looks beautiful in person and is a perfect way to showcase your ink. It is easy to fill, comfortable to hold and the stub nib is wonderful. It has quickly become one of my most reached for fountain pens while journaling.
